Social finance aims to generate social and environmental impact alongside financial returns. This chapter explores the landscape of social finance, examining its successes, failures, and challenges. Through a comprehensive analysis, the chapter discusses key organizations, initiatives, and products such as social banks, social impact bonds, social ventures, green bonds, and crowdfunding that have contributed to successful social finance with the support of effective collaboration among multiple stakeholders, innovative funding mechanisms, robust impact measurement frameworks, and successful regulatory environments. The challenges and setbacks assessed include the complexities of measuring the social impact of financial returns. This study provides insights into the dynamics of social finance in developed markets. The findings aim to guide policymakers, investors, and practitioners to achieve meaningful social impact.